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Influence of planting date on common cocklebur (Xanthium strumarium) interference in early-maturing soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

G. Scott Rushing  and
Lawrence R. Oliver
G. Scott Rushing
Affiliation:
BASF Corp., 2601 Costner Court, #3, Albany, GA 31707
Lawrence R. Oliver*
Affiliation:
Department of Agronomy, University of Arkansas, Fayetteville, AR 72701
*
Corresponding author.
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Abstract

Field studies were conducted to determine the effect of common cocklebur interference in early-maturing (maturity group IV) soybean planted in April, May, and July. Common cocklebur density and length of interference did not affect soybean height, canopy width, or node number at any planting date. Removal of common cocklebur 4 weeks after emergence (WAE) prevented reduction of soybean leaf area, stem dry weight, dry leaf weight, dry pod weight, and seed yield. Aboveground biomass for common cocklebur emerging in July was less than biomass of April or May plantings. Common cocklebur planted into soybean 2, 4, or 8 wk after soybean emergence did not reduce soybean yield. Under parameters of this study, planting date was not a significant factor in yield reduction. Interference from one common cocklebur plant per 1.8, 0.9, and 0.3 m of soybean row for 8 wk reduced yields 7, 14, and 30%, and full-season interference reduced yields 16, 33, and 65%, respectively. The Arkansas Weed Management Computer program closely predicted actual yield loss for early-maturing soybean.

Keywords

Common cocklebur, Xanthium strumarium L. XANSTsoybean, Glycine max (L.) Merr. ‘Pioneer 9442.’Group IV soybeancomputer management aidindeterminate soybeanweed biomassweed densityweed plantbackweed removalXANST
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 1 , February 1998 , pp. 99 - 104
Copyright
Copyright © 1998 by the Weed Science Society of America 

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